Token actuating circuit

ABSTRACT

The actuating circuit disclosed is operable for verifying authenticity of a token and initiating energization of the control circuit. The actuating circuit verifies the size and conductivity characteristics of the token and triggers energization of a control circuit through a gate-controlled rectifier.

United States Patent [72] inventor Quintin N. Rottering Newton, Iowa [21] Appl. No. 801,264

[22] Filed Feb. 24, 1969 [45} Patented Jan. 19, 1971 {73] Assignee The Maytag Company Newton, Iowa a corporation of Delaware [54] TOKEN ACTUATING CIRCUIT 10 Claims, 3 Drawing Figs.

US. Cl 194/4 G071 1/06 Field of Search l94/6, 7, 8, 100,99, 97,4

[56] References Cited UNITED STATES PATENTS 3,136,402 6/1964 Smith l94/6X Primary Examiner-Stanley H. Tollberg Atzorney-William G. Landwier ABSTRACT: The actuating circuit disclosed is operable for verifying authenticity of a token and initiating energization of the control circuit. The actuating circuit verifies the size and conductivity characteristics of the token and triggers energizetion of a control circuit through a gate-controlled rectifier.

f L 1 I55 Q9) l i (E -95 TOKEN ACTUATING CIRCUIT BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an actuation system including use of a token for energizing a machine and more particularly to an actuating circuit using a thyristor as the trigger means for effecting energization.

2. Description of the Prior Art Prior art U.S. Pat. Nos. 3,136,402 and '3,l65,l87 issued to T. R. Smith and assigned to the assignee of the instant invention disclose control systems including useof a token for initiating energization of a machine. These patents disclose'use of an actuating circuit comprising, as a trigger means. the

combination of a neon tube and photoelectric cell responsive to the insertion of a proper token for effecting energization of the control circuit.

These prior disclosures rely on a deformation of the token to prevent a recycling of the machine upon completion of any one cycle of operations, but other control systems wherein. an undestroyed token remains in the mechanismhave been used by the assignee of the instant invention inconjunction with the prior art systems. Recycling is prevented through the use of relays and the insertion of another token is necessary to effect actuation of the machine for a newcycle of operations.

SUMMARY OF THE INVENTION It is an object of the instant invention to provide an improved token-actuating circuit having an improved trigger means responsive to a valid token for effecting energization of the control circuit. w I g It is a further object of the instant invention to provide a token-actuating system including thyristor means responsive to an authentic token for effecting a single energization of the controlled machine.

It is a still further object of the instant invention to provide a token-actuating system including a .pair of gate-controlled rectifiers wherein a first rectifier is operable for initiating energization of the machine responsive to a valid token and wherein the pair of gate-controlled rectifiers are effective for preventing energization of the machine responsive to an invalid token. I

It is a still further object of the instant invention to provide a token-actuating circuit including a voltage divider network operable upon insertion of the proper token for effecting energization of the machine through a thyristor trigger means.

The instant invention achievesthese objectsin a token-actuating circuit including thyristor means operable to a conductive condition responsive to completion of aproper conductive circuit across one leg of a voltage divider network and through a conductiveportion of an authentic token for initiating energization of the control circuit of the'machine.

Operation of the device and other objects and advantages thereof will become evident as the description proceeds and from an examination of the accompanying page of drawings.

DESCRIPTION OF THE DRAWINGS The drawings illustrate a preferred embodiment of the invention with similar numerals referring 'to similar parts throughout the several views, wherein:

FIG. 1 is an enlarged longitudinal section view of the token DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the accompanying drawings, there is illustrated in FIG. I a token receiver assembly 10 including a front plate II, a top wall 13 having a printed circuit on its lower face, and a bottom wall 14 spaced from the top wall by a contact retainer 15. The top wall 13 and contact retainer 15 are formed of nonconductive materials and are held together in sandwich form with bottom wall 14 by a plurality of screws 16. The retainer 15 is formed with a longitudinal recess 17 and with the bottom wall forms a slot 18 thcrebetween. This sandwich assembly is attached to the front plate II at the downwardly extending front flange I9 of the bottom wall 14 by a pair of screws 20. The front plate II is formed with a semispherical recess 21 and an elongated aperture 23 to facilitate insertion of a token 24 into the longitudinal slot 18 between the contact retainer 15 and bottom wall 14. The front plate 11 is also formed with rear studs 25' to facilitate attachment of the token receiver assembly 10 to a panel (not shown) of the controlled machine.

A bracket 33 is mounted on the top wall 13 and attached with screws 34. Formed in the bracket is a sloping clutch ramp 35 which in conjunction with a spring 36, extending through a narrow slot 39, and roller 40 provides a one-way clutch for en gaging the inserted token 24 and preventing withdrawal thereof.

As also indicated in FIG. I, the contact retainer 15 is formed with several holes 41 to accommodate an electrically conductive spring 43 and ball 44 which cooperate to function as an electrical contact 45 engageable between the printed circuit of'the top wall 13 and the inserted token 24. In a preferred embodiment of the invention, nine identical contacts 45 are provided but this number may be greater or smaller. The top wall 13 is also provided with means at the rear end 49 thereof for receiving electrical connectors (not shown) to connect the circuitry of the top wall, and in turn each of the contacts 45, with the control circuit. The token 24 in turn contains an electrically conductive printed circuit on its surface engageable by selected contacts for completing a circuit therebetween. It is thus clear that a circuit may be completed from an electrical terminal connected to the top wall 13, through the printed circuit of the top wall 13, through the contact spring 43 and contact ball 44, and through the circuit on the surface of the token 24.

Mounted on the bracket 33 of the token receiver assembly 10 is a single-pole double-throw switch 50. The switch 50 is 'actuated by a pivotal arm 51 which extends downwardly through an opening in the sandwich assembly. The pivotal arm 51 terminates at its lower extremity in an end finger 52 which is abutted by an inserted token-24 so as to move the arm SI to close the normally open contacts of the switch 50.

Referring now to FIG. 3, there is shown a token 24 having on at least one face thereof electrically conductive material 54 in a prearranged pattern and shown as the darker areas with crosshatching in FIG. 3. The token 24 may be in the form of a ticket or card with the electrically conductive material 54 arranged so as to be engaged by at least some of the contacts 45. Preselected electrical contacts 45 engage the conductive portion 54 on the face of the token 24 for completing a circuit through the conductive material and for this reason the conductive material 54 is in a pattern related to the arrangement of the electrical contacts 45. As previously indicated the preferred embodiment of the instant invention utilizes nine contacts 45 which are arranged to engage the token 24 at the contact points 60 through 68 indicated by the heavy circular dots on the token in FIG; 3. Thus it is seen that an electrical circuit may be completed between the contact points 60-61 or 62-64. The circuit may also be arranged by bussing or jumpers in the token receiver assembly so that the circuit may be completed through both of the conductive portions engaged by the two pairs of contacts at contact points 60-61 and 62-64.

In order to make counterfeiting of the token more difficult, the face of the token may additionally contain nonconductive printed material 70 as is shown by the lighter shaded areas in FIG. '3. The nonconductive material 70 has an appearance substantially indistinguishable from the conductive material 54 on an authentic token but is shown with lighter shading than the conductive material in FIG. 3 for purposes of explanation. The conductive and nonconductive patterns may be arranged in various designs to disguise and conceal the location of the electrically conductive material 54.

The actuation circuit, as will be more fully described hereinafter, requires that selected ones of the contacts 45, which shall be called operating contacts, engage the token 24 at preselected locations on the electrically conductive material 54 such as at points 60, 61, 62, and 64 to complete a circuit therethrough and requires that selected others of the contacts which shall be called shorting contacts engage the token 24 at locations which are not electrically connected to any of the operating contacts. In this embodiment. the camouflaging nonconductive material 70 on the surface of the token 24 is engaged by selected shorting contacts at contact points 63, 65, 66, 67, and 68 in FIG. 3, but it is also pointed out that these shorting contacts could engage the token base member directly if it is electrically nonconductive.

This token receiver assembly and the token 24 useful therewith are similar to the device and token shown in US. Pat. No. 3,l65,l87 issued Jan. 12, I965 to T. R. Smith and assigned to the assignee of the instant invention. Reference may be had to that patent for further description of the construction and operation of the token receiver assembly and of the token useful therewith.

Referring now to FIG. 2, a preferred embodiment of the invention will be described in connection with the energization and control of an automatic washing machine.

This circuit is supplied with ll0 volt 60 cycle alternating current between lines 80 and 81. It is assumed that line 80 is the power line and line 81 is the neutral line. The machine control circuit includes a plurality of sequentially-operated timer program control switches 83 through 87 shown in FIG. 2 as pairs of contacts. These switches are sequentially operable between open and closed positions under control of a timing motor 89 and will be referred to as timer switches 83 through 87. The machine control circuit further includes a water level control in the form of a pressure responsive switch 90 operable between first and second contacts 91 and 93. Operation of the switch 90 to the contact 91 when the washing machine container is substantially empty completes a circuit to a water valve coil 94 through the timer switch 86. The washing machine circuit also includes a drive motor 95 selectively energized under control of the timer switch 85 shown in the open condition in FIG. 2.

The token switch 50 is biased to a first contact 100 and is operable to a second contact 101 by the token 24. Referring again to FIG. 3, the end finger 52 of the switch lever 51 is shown at the adjoining radii 104 of the adjacent tokens 24 with the new token partially inserted. As the new token 24 is inserted to the position shown in FIG. 3, the end finger 52 of the lever 51 will drop off the edge of the previously inserted token into the notch 105 created by the radii 104 of the adjacent tokens. The movement of the end finger 52 into this notch 105 effects operation of the switch 50 to its biased position for making the switch 50 to its first contact 100. This substantially momentary operation of the switch to its first contact 100. as the token is inserted, performs a function in the actuation of the circuit as will be shown hereinafter.

The actuation circuit of the instant invention shown in FIG. 2 includes a first portion shown generally by arrow 110 and operable for verifying the authenticity of the printed circuit of conductive portions 54 on the face of the token 24. This portion of the circuit is under control of the token switch 50 and includes a DC power supply comprising the resistor 113, rectifier 1 l4, and capacitor 115.

The circuit of FIG. 2 further includes a pair of relays. The first relay may be considered as part of the token verification circuit portion 110 and includes a coil 116 energized through the DC power supply for closing a switch 117 responsive to operation of the token switch 50 to its first contact 100. The switch 117 completes a holding circuit for effecting the next step in the token verification process. The second relay coil 120 is energized responsive to a positive check ofa valid token by the token verification circuit portion and closes a switch 121 to complete a bypass circuit around the open timer switch 87. In the preferred embodiment, the two relays are in the form of reed relays including a reed coil and a reed switch operable to a closed position upon energization of the reed coil. Voltage dropping resistors I23 and 124 are provided in series with the reed coils I16 and 120. respectively.

Solid state switching is used in the token verification circuit portion of FIG. 2 to effect selective energization of the relay coil 120. A thyristor in the form ofa silicon-controlled rectifier or SCR 127 is provided. The SCR 127 is normally nonconductive but is operable to a condition of conduction between the anode 128 and cathode I29 responsive to a predetermined voltage and current flow across the gate 130 to cathode I29 path.

A voltage divider network is connected to the power supply between the rectifier 114 and the capacitor 115 and includes a first portion or leg comprising a pair of resistors 133 and 134 connected to the pair of contacts 45 engageable with the conductive portion 54 of the token at contact points 62 and 64, for example, and also includes a second leg comprising a resistor 135 connected across the gate 130 and cathode 129 of the SCR 127. A filter capacitor 136 is connected in parallel to the resistor 135. Upon completion of a circuit between the pair of contacts engaging the conductive material of the token at points 62 and 64, for example, a circuit will be completed through the voltage divider network and to the gate 130 of the SCR 127 to provide sufficient current and voltage across the gate 130 to cathode 129 path of the SCR 127 to cause the SCR 127 to become conductive between the anode 128 and the cathode 129.

A similar trigger circuit portion is connected to the shorting contacts engaging the token at contact points 63, 65, 66, 67, and 68 and includes a pair of resistors 140 and 141 and a filter capacitor 142 across the second resistor 141. A second SCR 143, including a gate 144 and cathode 145 connected in parallel to the second resistor 141, is connected into the second trigger circuit portion and is operable to a conductive condition, when line 80 is the power line, upon completion ofa conductive path between the contact 45 engaging the token at point 63, for example, and the contact engaging the token at point 64. Completion of this circuit provides sufficient voltage and current across the anode 146 to cathode 145 path of the SCR 143 for switching the SCR 143 to a conductive condition. Conduction across the anode and cathode of SCR 143 effectively short circuits the anode to cathode path of the first SC R 127 and thereby prevents actuation of the machine by preventing energization of the relay coil 120 which is in series with the anode to cathode path of SCR 127.

As previously indicated, this operation of the circuit is that occurring when line 80 is the power line, as assumed for the purposes of circuit explanation. If, however, line 81 becomes the power line and line 80 becomes the neutral line through a reversal of polarity, the operation of the verifying circuit when encountering improperly conductive material will be different but will achieve the end objective of preventing energization of the relay 120 when conductive material is engaged by the shorting contacts. More specifically, if line 81 becomes the power line the voltage divider network established to the two parallel-connected SCRs sufficiently limits the gate voltage to the SCRs to prevent actuation of the SCRs to the conductive condition and thus prevents energization of relay coil 120. It is therefore seen that regardless of the polarity of the circuit, a token having improperly conductive portions will not actuate the machine.

In a preferred embodiment, the resistors and capacitors shown in FIG. 2 have representative values as follows: The voltage-dropping resistors 123 and 124 in series with the reed coils 116 and 120 each have a value of 15,000 ohms. The voltage divider resistors 135 and 141 across the anode to cathode path of the two SCRs 127 and 143 each have a value of 1,800 ohms and the current-limiting resistor 113 in the DC power supply has a value of 680 ohms. The voltage divider resistors connected to the contacts 45 at contact points 63, 62, and 64 have values of l20,000 ohms. 120.000 ohms. and 100,000 ohms. respectively. The filter capacitors 136 and 142 across the anode to cathode path of the SCRs 127 and 143 each have a value of 0.1 microfarad. The capacitor 115 in the DC. voltage supply has a value of l microfarad.

Energization of the machine upon closing of the relay reed switch 121 includes. initially. energization of the fill valve coil 94 and energization of the timing motor 89. The timer is programmed to effect opening of the timer switch 84 and the closing of timer switch 87 to remove the token verification circuit portion 110 from the overall control circuit while placing control of the machine on the timer. Timer switch 85 will also be closed to effect energization of the drive motor 95. The machine will now proceed through a normal cycle of operations under control of the timer.

More specifically, the circuitry and operation of the components in a normal actuation sequence will now be described.

The circuit. shown in FIG. 2 is depicted at the point in time after completion of the prior cycle of operations and prior to insertion of another valid token. In this circuit, the lid switch 150 is closed, t'imer switches 83, 84 and 86 are in the closed condition and timerswitches 85 and 87 are in the open condition. The two relay coils 116 and 120 are shown deenergized with their respectively controlled reed switches 117 and 12l in the open condition. In such a circuit condition, the washing machine is in an *off condition.

Upon partial insertion of a valid token 24, the token switch lever end finger 52 drops into the notch 105 created by the adjoining corner radii 104 and the token switch 50 operates to its first contact 100. A circuit is completed for energizing the first relay coil 116 from line 80 through the token switch 50 made to its first contact 100, through the junction 151, the relay coil 116, the voltage dropping resistor 123, and the conductor 152 to the junction 153. The circuit continues through the rectifier 114, theresistor 113, and the closed timer switches 84 and 83 to line 81. This is a momentarily completed circuit; however, upon closure of the switch 117 by the relay coil 116, a holding circuit is completed from line 80 through the switch 117 to the junction point 151.

As the insertion of the token continues, the token switch 50 is operated from its first contact 100 to a second contact 101. Upon full insertion of a valid token, the charging contacts engage the conductive material and a circuit is completed to the SCR 127 for triggering the SCR 127 from a nonconductive condition to a conductive condition. The energizing circuit for the SCR 127 is in the form of a voltage divider network with a predetermined voltage being maintained across the power supply capacitor 115. A first leg of the voltage divider network comprises a circuit connected to the junction point 153 and including the conductors 152 and 160, resistors 133, 134 and conductive portion 54 of token 24, conductor 161, and junction 162. The second leg of the voltage divider network extends from junction 162 and includes resistor 135, conductors 165, 166 and 167, token switch 50, andswitch 117. The voltage divider network provides sufficient voltage and current across the gate 130 and cathode 129 of the SC R 127 to trigger the SCR 127 to a conductive condition.

Upon the SCR 127 becoming conductive, a circuit is completed for energizing the second reed coil 120 to effect energization of the machine. The relay coil energizing circuit extends from power line 80, through the closed reed switch 117, the token switch 50 made to its second contact 101, and through conductors 167, 166 and 165 to the cathode 129 of SCR 127. The circuit continues across the cathode 129 and anode 128 of the SCR 127 to one side of the reed coil 120. The other side of the reed coil 120 is connected to line 81 through the voltage-dropping resistor 124, conductor 152, junction point 153, rectifier 114, current-limiting resistor 113, and closed timer switches 83 and 84. Upon energization of the reed coil 120, the reed switch 121 is closed for completing a circuit around the open timer switch 87.

Energization of the water valve coil 94 is effected by a circuit extending from line through the switch 117. switch 50 made to its second contact 101. conductor 167, reed switch 121, and conductors 170 and 171 to one side of the water valve coil 94. The other side of the water valve coil 94 is connected to the line 81 through the closed timer switch 86 and pressure switch made to contact 91. The energizing circuit for the timing motor 89 extends from the conductor 170 to line 81 through the junction 173 and throughthe closed timer switch 83. After a predetermined period of operation of the timing motor 89, one increment of advance, for example, timer switch 84 will open and timer switches 85 and 87 will close to effectively remove the token verification circuit portion from the control circuit and to energize the drive motor 95 under control of the timer.

If a conductive path is established through conductive material other than the preselected material engageable by the operating contacts engaging the token at points 62 and 64, for example, a circuit is completed through the shorting contact at point 63, for example, to an auxiliary circuit portion including the second SCR 143. If line 80 is the power line, the SCR 143 becomes conductive in a manner similar to the first SCR 127 to effectively short circuit the conductive path across the anode 128 and cathode 129 of the first SCR 127. Under such a circumstance, the reed coil is not energized and the machine is not energized.

In a system as described above where the token is not invalidated in the actuation process, the tokens may fall into a container within the machine as they are pushed out of the token receiver assembly 10 and reused for actuating the machine. Or, if desired, the tokens may instead be invalidated by an independent process following the actuation process.

In the drawings and specification, there has been set forth a preferred embodiment of the invention and although specific terms are employed these are used in a generic and descriptive sense only and not for purposes of limitation. Changes in form and the proportion of parts as well as the substitution of equivalents are contemplated as circumstances may suggest or render expedient without departing from the spirit or scope of this invention as further defined in the following claims.

I claim:

1. An actuation system for a machine, comprising: first circuit means for energizing and controlling said machine through a cycle of operations; receiver means for reception of a token; means associated with said receiver means for verifying the authenticity of at least one token characteristic, said verifying means including means for completing an electrical path through a preselected electrically conductive portion of said token, said verifying means further including thyristor means operable from a first condition to a second condition responsive to completion of said electrical path through said preselected conductive portion; and second circuit means responsive to the second condition of said thyristor means for conditioning said first circuit means for initiating said cycle of operations.

2. An actuation system for a machine as defined in claim I wherein said verifying means includes a first relay means responsive to insertion of a proper token into said receiver means for energizing said verifying means and wherein said second circuit means includes second relay means responsive to operation of said thyristor means to said second condition for effecting initiation of said cycle of operations through said first circuit means.

3. An actuation system for a machine as defined in claim 1 wherein said thyristor means includes an SCR operable in said second condition for energizing said second circuit means and initiating said cycle of operations.

4. An actuation system for a machine as defined in claim 3 including a second SCR responsive to completion of an electrical path through conductive material other than said preselected conductive portion for preventing energization of said second circuit means.

5. An actuation system for a machine as defined in claim 4 wherein said first and second SCRs are parallel-connected and wherein said first SCR is operable to a conductive condition responsive to completion of said electrical path through said preselected conductive portion and said second SCR is operable to a conductive condition responsive to completion of said electrical path through said other conductive material for shunting the conductive path through said first SCR.

6. An actuation system for a machine comprising: first circuit means for energizing and controlling said machine through a cycle of operations; receiver means for reception of a token; means associated with said receiver means for verifying the authenticity of at least one token characteristic and including normally nonconductive thyristor means. said verifying means further including voltage divider means for triggering said thyristor means to conduction upon completion of an electrical path through one leg of said voltage divider means including a preselected electrically conductive portion of said token; and second circuit means responsive to conduction through said thyristor means for actuating said first circuit means and initiating said cycle of operations.

7. An actuation system for a machine as defined in claim 6 wherein said one leg of voltage divider means is across the preselected conductive portion of the token and a second leg of the voltage divider means is in parallel with the gate to cathode path of the thyristor means.

8. An actuation system for a machine. comprising: first circuit means for energizing and controlling said machine through a cycle of operation; receiver means for. reception of a token; means associated with said receiver means for verifying the authenticity of at least one token characteristic. said verifying means including means for completing an electrical path through a preselected electrically conductive portion of said token and further including SCR means operable to a conductive condition responsive to completion of said electrical path; and second circuit means including relay coil means operable from a first to a second state of energization responsive to conduction through said SCR means for conditioning said first circuit means for initiating said cycle of operations.

9. An actuation system for a machine as defined in claim 8 wherein said verifying means further includes a second SCR means connected in parallel to said first named SCR means and responsive to completion of an electrical path through other than said preselected conductive portion for preventing operation of said relay coil means to said second state ol'energization.

10. An actuation system for a machine, comprising: first circuit means for energizing and controlling said machine through a cycle of operations; receiver means for reception of a token; means associated with said receiver means for verifying the authenticity of at'least one token characteristic and including a first relay means responsive to insertion of a proper token into said receiver means for energizing said verifying means, said verifying means further including means for completing an electrical path through a preselected electrically conductive portion of said token and still further including SCR means operable to a conductive condition responsive to completion of said electrical path; and second circuit means including a second relay coil operable from a first to a second state of energization responsive to conduction through said SCR means for conditioning said first circuit means for initiating said cycle of operations. 

1. An actuation system for a machine, comprising: first circuit means for energizing and controlling said machine through a cycle of operations; receiver means for reception of a token; means associated with said receiver means for verifying the authenticity of at least one token characteristic, said verifying means including means for completing an electrical path through a preselected electrically conductive portion of said token, said verifying means further including thyristor means operable from a first condition to a second condition responsive to completion of said electrical path through said preselected conductive portion; and second circuit means responsive to the second condition of said thyristor means for conditioning said first circuit means for initiating said cycle of operations.
 2. An actuation system for a machine as defined in claim 1 wherein said verifying means includes a first relay means responsive to insertion of a proper token into said receiver means for energizing said verifying means and wherein said second circuit means includes second relay means responsive to operation of said thyristor means to said second condition for effecting initiation of said cycle of operations through said first circuit means.
 3. An actuation system for a machine as defined in claim 1 wherein said thyristor means includes an SCR operable in said second condition for energizing said second circuit means and initiating said cycle of operations.
 4. An actuation system for a machine as defined in claim 3 including a second SCR responsive to completion of an electrical path through conductive material other than said preselected conductive portion for preventing energization of said second circuit means.
 5. An actuation system for a machine as defined in claim 4 wherein said first and second SCRs are parallel-connected and wherein said first SCR is operable to a conductive condition responsive to completion of said electrical path through said preselected conductive portion and said second SCR is operable to a conductive condition responsive to completion of said electrical path through said other conductive material for shunting the conductive path through said first SCR.
 6. An actuation system for a machine, comprising: first circuit means for energizing and controlling said machine through a cycle of operations; receiver means for reception of a token; means associated with said receiver means for verifying the authenticity of at least one token characteristic and including normally nonconductive thyristor means, said verifying means further including voltage divider means for triggering said thyristor means to conduction upon completion of an electrical path through one leg of said voltage divider means including a preselected electrically conductive portion of said token; and second circuit means responsive to conduction through said thyristor means for actuating said first circuit means and initiating said cycle of operations.
 7. An actuation system for a machine as defined in claim 6 wherein said one leg of voltage divider means is across the preselected conductive portion of the token and a second leg of the voltage divider means is in parallel with the gate to cathode path of the thyristor means.
 8. An actuation system for a machine, comprising: first circuit means for energizing and controlling said machine through a cycle of operation; receiver means for reception of a token; means associated with said receiver means for verifying the authenticity of at least one token characteristic, said verifying means including means for completing an electrical path through a preselected electrically conductive portion of said token and further including SCR means operable to a conductive condition responsive to completion of said electrical path; and second circuit means including relay coil means operable from a first to a second state of energization responsive to conduction through said SCR means for conditioning said first circuit means for initiating said cycle of operations.
 9. An actuation system for a machine as defined in claim 8 wherein said verifying means further includes a second SCR means connected in parallel to said first named SCR means and responsive to completion of an electrical path through other than said preselected conductive portion for preventing operation of said relay coil means to said second state of energization.
 10. An actuation system for a machine, comprising: first circuit means for energizing and controlling said machine through a cycle of operations; receiver means for reception of a token; means associated with said receiver means for verifying the authenticity of at least one token characteristic and including a first relay means responsive to insertion of a proper token into said receiver means for energizing said verifying means, said verifying means further including means for completing an electrical path through a preselected electrically conductive portion of said token and still further including SCR means operable to a conductive condition responsive to completion of said electrical path; and second circuit means including a second relay coil operable from a first to a second state of energization responsive to conduction through said SCR means for conditioning said first circuit means for initiating said cycle of operations. 